Classifier.



No. 820,934. PATENTED MAY 15, 1906.

' C. W. MERRILL.

GLASSIFIER.

APPLICATION FILED AUG.4,1905.

2 SHEETS-SHEET l.

WITNESSES: INVENTOR 46: I.

, By lzis Afzomey,

No, 820,934. PATENTED MAY 15, 1906.

O. W. MERRILL.

GLASSIFIER.

APPLICATION FILED AUG.4,1905.

' 2 SHEETS-SHEET 2.

WITNESSES: INVENTOR' ,yfl m B In; Aftom y iiwmmm aafi ywwwwwww no. nausea.

Specification of Letters Patent.

Patented May 15, 1906.

' Original application filed November 26, 1904, Serial No. 284,806. Divided and this application filed August 4,1905. Serial No. 272,720-

' following is a specification.

My invention relates to improvements in apparatus for separating the heavier or coarser from the lighter or finer components found in tailings of ores or in other valuable material, these separations being technically own as concentrating, classifying, clarifying, &c.

These improvements consist in providing classifiers with lines of overflow made of soft material which may be easil kept level.

in the crushing of ores wit water, to which wet-crushing my-invcntion relates, after the pull ,which is a mixture of the crushed ore wit water, has been subjected to such treatment as may be desired, such as amalgamation or concentration, 860., it is customaryto se arate it into coarse and fine particles. T 's is eflected by classifiers having in general a discharge at the bottom for the coarser material, to ether with a portion of t ewater, and an over ow-line over which the finer particles and a portion of water overflow. Such classifiers are simple gravity classifiers or hydraulic classifiers, which differ from the sim le gravity-classifiers in that they have a was -water inlet at the-bottom.

In the apparatus which have been emf other shaped hoppers, tanks, or receivers made of iron, porce ain, wood, &c., have been emplol&ed, the overflow-peripheries of which are d' cult to make and keep level. For instance, cast and sheet iron cones have been used with iron lines of overflow; similarly,

orcelain vessels with orcelain lines of overow. Also wooded ta have been used with the line of overflow consist' of end wood, such as the ends of staves, said line of overflow thus being across or transverse to the ain of the wood. With all of these materials 1t is dificult to make the line of overflow as perfectly level as is necessary to minimize uneven currents'or velocities .overthe line of overflow. Such uneven currents interfere with the most eflicient classification or separation.

In addition to the above difficulty in first eflecting an even line of overflow with such apparatus, any uneven settling of the apparatus introduces a further dificulty in maintaining the line of overflow sufficiently level to minimize uneven velocities thereover.

Now I have discovered that b making the overflow line of the receiver 0 the classifier either of a thin strip of soft metal or an alloy softer than iron--such for example as lead or ewterthe dificulties above referred to will e obviated.

The invention will be best understood by reference to the accompanfying two sheets of drawinis, forming-a part 0 tin in whic Figure 1 is a plan view of aclassifier embodying my invention. Fig.2 is a vertical section of the classifier on the line C (l, Fig.- l Figs. 3, 4t, and 5 show vertical sections of the upper portion of theclassifier, and Fig. 6 is an e evation showing the method of'attachmg the rim of the classifier to the body.

-s specification,

Similar characters refer to similar parts throu hout the several views.

In igs. l and 2, it represents the inflowpipe, n represents the outflow-pipe, r represents the edge of the overflow-line, and q represents the spout through which the overfiow passes out.

The classifier consists of a cone-shaped shell Z, restin in a conical box at, to which itis attached by the bolts 1 1, and from it emerges the outlet-pipe n. The overflow is collected in an annular trough composed of a ring 0,

bolted by the bolts 2 to the upper edge of the shell 1, as shown in Fig. 2, to which is bolted a cylindrical shell p by means of the bolts 3.

The soft-metal overflow-line (shown in Figs. 3 to 6, inclusive) may be attached to the shell by the bolts 4, as shown. V

The overflow-line can readilylbe kept level by planing or beveling down t e edge of the part 1' from time to time, as maybe necessary claim for t e purposes of this application a static classifier with a sheet-iron body provided with an overflow-line of a soft subtoo stance, substantially of the character s eoified in said application, having a feed w olly within the periphery.

I claim as my invention-- 1. A classifier provided with an overflowline of soft metal, substantially as described.

2. A classifier provided with an overflowline of soft metal extending around its entire periphery, substantially as described.

3. A static classifier consisting of a re-. ceiver having a feed wholly within the eriphery, and said periphery bein provi ed with an overflow-line of soft metal, substantially as described. I

4. A static classifier consistin of a re- I 5 ceiver having a sheet-iron body, a eed wholly within the periphery, a bottom discharge and an overflow-rim composed of a strip of soft metal.

In testimony that I claim the foregoing as 20 my invention I have signed my name, in the presence of two witnesses, this 29th day of July, 1905.

CHARLES W. MERRILL.

Witnesses: I

WM. FRAoKELToN, G. D. FOGLESONG. 

